Improvement in extension-dividers



UNITED nSTATES PATENT OFFICE.

GEORGE G. MILLER, OF DETROIT, MICHIGAN, ASSIGNOR TO JAMES C. MALOY,

OF OIL CITY, PENNSYLVANIA. y

IMPROVEMENT IN EXTENSION-DIVIDERS.

Specification forming part of Letters Patent No. 144,468, dated Nov( mher 11,1873; application filed June 3, 1873.

To all 'whom it may concern:

Beit known that l, GEORGE C. MILLER, of Detroit, in the county o Wayne and State of Michigan, have invented a new and useful Improvement in Extension-Dividers; and I do declare that the following is a true and accurate description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, and being apart of this specification, in which- Figure 1 is a ,perspective view of my improved extension-divider leg, not compressed, so that the point may be withdrawn. Fig. 2 is a perspective view, showing the cam-ring turned to compress the point in the end of the leg. Fig. 3 is a perspective view of the leg.4

Fig. 4 is a similar view of the cam-ring.

Like letters refer to like parts in the several figures.

The nature of the invention relates t0 an improvement in that class ot' dividers which have one or both legs tubular, for the reception of an extensible or reversible point, and has for its object to provide a simple and e'ective means for fastening the point in the leg; and to this end it consists in longitudinally slottingthe end of the leg-tube, so that the tongues may be compressed by a cam-ring acting upon the tapered ends th ereof to secure the point, in the manner more fully hereinafter set forth.

In the drawing, A represents the tubular leg of my divider, its bore being of such diameter as to receive the point B. The outer part of the tube has four longitudinal slits, a, sawed or cut in it, making four elastic tongues, on one of which is formed an outward-.projecting iiange, b, whose inner edge is obliquely` or` flange b. When the deepest part of the cam d lies against the ange b, the ring embraces only the reduced diameter of the leg, whose tongues are not then compressed inwardly; but, when partially rotated, the ,action of the cam on the flange b is such as to force the ring up the leg onto the cone c, thereby compressing the tongues upon the point. A reverse movement of the ring releases the point from the pressure of said tongues.

The ring takes up but little space, does not interfere with the functions of the instrument, and cannot readily be detached and lost, while it holds the point with great rmness and power, and is in every way superior to the set-screws and screw-cla1nps heretofore used for securing the point to the leg.

What I claim as my invention, and desire to secure by Letters Patent, is

The combination, with the slotted tubular leg A, provided with the ilange b and cone c, of the cam-ring C, substantially as and for the purpose set fort-h.

GEO. C. MILLER.

Witnesses H. F. EBERTs, CHAs. E. HUEsTIs. 

